P2944R3 Comparisons For `reference_wrapper`
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Description
WG21-P2944R3 Comparisons For reference_wrapper
WG21-P3379R0 Constrain expected Equality Operators
LWG-4071 reference_wrapper comparisons are not SFINAE-friendly
LWG-4072 std::optional comparisons: constrain harder
Also tracked by #5873 (this is half "implement downlevel", half "patch C++26"):
LWG-4366 Heterogeneous comparison of expected may be ill-formed
Feature-test macros:
#define __cpp_lib_constrained_equality 202411L
#define __cpp_lib_reference_wrapper 202403L
Note: We are not yet accepting PRs for C++26 features.
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading WG21-P2944R3 and WG21-P3379R0 alongside LWG-4071, LWG-4072, and LWG-4366; issue #5873 tracks related work. The issue lists expected feature-test macros, but provides no files, tests, or implementation entry points, and states that PRs for C++26 features are not yet being accepted.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- devtools
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 15/100